diff --git a/docs/requirements.txt b/docs/requirements.txt
index 7c9ee51..ea1bdc1 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -4,4 +4,5 @@ numpy
 recommonmark
 m2r
 scipy
+sphinx-rtd-theme
 git+https://github.com/telegraphic/pygedm
\ No newline at end of file